Help pls which of the following statements best describes the impact of immigration during the 1800s?

A. labor was cheap due to the arrival of many immigrants
B. most immigrants arrived in the state of florida first
C. new immigrants were considered very skilled workers
D. immigration had little effect on the building of the railroad

answer; ///the correct answer is,by introducing a merit system of nobility.

to fight against injustice and class division

option d is correct. corroborated sources of historical evidence   is necessary to validate a claim about an event in history.

historians tend to use written sources, but audio and visual materials as well as artifacts are important objects that supply information to modern historians.

historical sources are usually divided into two categories: primary and secondary sources. depending on the historian's intent, some sources shift their designation. determining what type of sources toimplement, and the level of credibility and reliability of those sources, is a significant step in critical thinking for the historian.

explanation:

i think it is true i hope this is